svn commit: r50598 - head/en_US.ISO8859-1/htdocs/news/status
Benjamin Kaduk <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.cvs.doc |
|---|---|
| Message-ID | <[email protected]> |
Author: bjk
Date: Fri Jul 28 21:22:11 2017
New Revision: 50598
URL: https://svnweb.freebsd.org/changeset/doc/50598
Log:
Add 2017Q2 arm64 entry from andrew
Modified:
head/en_US.ISO8859-1/htdocs/news/status/report-2017-04-2017-06.xml
Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2017-04-2017-06.xml
==============================================================================
--- head/en_US.ISO8859-1/htdocs/news/status/report-2017-04-2017-06.xml Fri Jul 28 21:15:41 2017 (r50597)
+++ head/en_US.ISO8859-1/htdocs/news/status/report-2017-04-2017-06.xml Fri Jul 28 21:22:11 2017 (r50598)
@@ -1699,4 +1699,59 @@
and <tt>net/coda_server</tt>).</task>
</help>
</project>
+
+ <project cat='arch'>
+ <title>&os;/arm64</title>
+
+ <contact>
+ <person>
+ <name>
+ <given>Andrew</given>
+ <common>Turner</common>
+ </name>
+ <email>[email protected]</email>
+ </person>
+ </contact>
+
+ <links>
+ <url href="https://wiki.FreeBSD.org/arm64">&os; arm64 Wiki Page</url>
+ </links>
+
+ <body>
+ <p>Support for the Privilege Access Never (PAN) feature was
+ added. This stops the kernel from accessing userspace
+ memory, except through specific instructions. This helps
+ security by only allowing access to userspace via the
+ correct accessor functions. This is enabled on all
+ supported CPUs that implement ARMv8.1 or later.</p>
+
+ <p>The <tt>pmap</tt> code now supports the Unprivileged
+ execute-never (UXN) and Privileged execute-never (PXN) bits
+ in the page tables. These bits stop userspace and the
+ kernel, respectively, from executing instructions on any
+ marked page.</p>
+
+ <p>The performance of the pmap layer has been improved. Many
+ of the cache handling function calls have been removed.
+ Some were needed early on to work around other bugs that
+ have now been fixed. The removal of these calls has led to
+ a large performance improvement.</p>
+
+ <p>The kernel now uses <tt>crc32c</tt> instructions where
+ appropriate. These are an optional set of instructions to
+ perform <tt>crc32c</tt> quickly without using a lookup
+ table.c</p>
+
+ <p>The <tt>VM_MEMATTR_WRITE_THROUGH</tt> memory attribute is
+ now supported. This is used to allocate memory for the
+ framebuffer. Previously, the kernel would use cached
+ memory; however, this leads to visual artifacts. The
+ write-through flag fixes these by writing data out to
+ RAM.</p>
+
+ <p>The default linker on arm64 is now <tt>lld</tt>. This
+ means &os; is able to built itsself with just the components
+ in the base system, a big milestone!</p>
+ </body>
+ </project>
</report>
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